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(No Model.) 2 Sheets-Sheet 1. G. S. STREET.

FRAME FOR PRINTING PHOTOGRAPHS. No. 268,242. Patented Aug. 22, 1882.

NY PETERS. Mmq dm WWO. D. c.

(No Model.) 2 Sheets-Sheet 2.

G. S. STREET.

FRAME FOR PRINTING PHOTOGRAPHS.

No. 263,242. Patented Aug. 22, 1882.

UNITED STATES PATENT OFFICE.

GEORGE S. STREET, OF MONOTON, NEW BRUNSWICK, CANADA, ASSIGNOR 0FONE-THIRD TO F. W. RICHARDSON, OF TROY, NEW YORK.

FRAME FOR PRINTING PHOTOGRAPHS.

SPECIFICATION forming part Of Letters Patent No. 263,242, dated August22, 1882. Application filed May 11,1882. (No model.) Patented inCanadaMurch 13, 1882.1). 14,355.

To all whom it may concern:

Be it known that I, GEORGE STOCKTON STREET, of the town of Moncton,county of Westmoreland, Province of New Brunswick, Canada, have inventedcertain new and useful Improvements in Frames for Printing Photographs,and more particularly for direct photography or blue printing; and Ihereby declare the following to be a full, clear, and exact descriptionof the same, reference being had to the annexed drawings and thisspecification. 1

My invention relates to the means whereby the tracing cloth or paper isbrought in contact with the glass. I effect this end by the applicationof an air-cushion in the place of cross-bars and set-screws asordinarily used.

The advantages gained by the use of my invention are, first, thepressure applied is uniform and lessens the liability to break theglass; second, the pressure can be applied instantaneously; third, theapparatus is entirely self-contained, there being no parts which it isnecessary to remove to accomplish the work in hand.

Figure 1 in the annexed drawings is a crosssection of the frame or pressand carriage. Fig. 2 is a longitudinal elevation of the carriage andframe, the latter being turned edgewise with the glass downward; andFig. 3 is a perspective view of the apparatus opened and ready toreceive the drawing and printing paper.

In all these figures like letters of reference, wherever they occur,indicate corresponding parts.

There are two frames, A A and B B, exactly the same size. One containsthe glass, and to the other is secured the air-cushion. In Fig. 1 theglass is indicated by a heavy black line marked 0, in Fig. 2 by thedotted lines marked 0, and is secured to the frame B B by pieces of tinlet into the frame and bent over the glass. The frame B B is rabbeted toreceive the glass, as shown.

The air-cushion D is formed of two sheets of rubber the same size as theframe A A, and is nailed thereto. The jointbetween the sheets can bemade in various ways.

The two frames A A and B B are hinged at the point E, Fig. 1, eitherwith strap or butt hinges, but preferably with strap-hinges atintervals, the number depending on the size of the frame. ()n theopposite side of the frame I place a system of levers, as shown, 5 andin such a manner that itis only necessary to fill the cushion once,after which the required pressure can always be obtained by the use ofthe levers F and F.

The hook G is made in such a way that it will turn round and thusdisengage with the frame A A, and also drop down below the level of theglass, and thus allow of tracings and paper being easily put into andremoved from the frame.

When the cushion is filled it is obvious that it will not come togetherat the front, and consequently, when drawn together by the hooks andlevers, the pressure is greatly augmented. Figs. 1 and 2 show the framesdrawn together 0 and the pressure on, the levers F F being held inposition by the spring J, which has a shoulder that catches on the underside of the levers. Now, if the levers F F are released, the cushionwill rise as far as the hooks G G will per- 7 mit, and to disengage thementirely it is necessary to give them a quarter-turn. The cushion-frameis then free to rise to such a height as to enable the operator toeasily remove or place his subject to be printed. The frames are heldapart by the quadrant L L, which has a spring thumb-catch. Theadjustment of the levers is effected by the nuts M M. The frames areprevented from swinging on the stand by the clamp-screw N N inconnection with the pivot 0.

The cushion may be filled by a pair of small bellows, an air-pump, or asmall blower, the pressure required being very small. The cushion can beeasily filled by simply blowing with go the mouth through a suitablepipe. 1 some times apply a safety-valve to the cushion to prevent theapplication of too great a pressure.

At either end of the frame containing the glass I place a box marked XX, Fig. 2, for the purpose of holding tracings, which are more than thelength of the printing-frame, and have to be printed in sections. Oneach box there is a lid or cover.

For the smaller sizes of printing-frames I do :00

not use the combination of levers and quadrant, but simply press the twoframes together by hand and secure them with a catch-spring.

I claim as my invention- 1. The combination of the upper and lowersections, hinged together as explained, one seetion carrying" the glassplate or panel and the other carrying an elastic air-cushion, and 1eversfor forcing and locking the two parts together, substantially as shownand described.

2. In a printing-frame mounted upon trunnions and adapted to revolve,substantially as explained, the combination, with the section carryingthe glass plate or panel, of the second section, hinged thereto andhaving the attached air-cushion, substantially as shown and described.

3. The combination of the two sections Aand B, the levers F F, the hooksG G, and the spring J, substantially as shown and described.

4. In a printing-frame having the two sections or parts hinged togetherand mounted upon trunnions and adapted to revolve, substantially asexplained, the combination, with the sect-ion carrying the glass plateor panel, of the boxes at each end of said section for holding theprojecting portions of the material being printed from or on,substantially as and for the purposes explained.

GEORGE STOCKTON STREET.

Witnesses:

EDWIN BUCKLAND, RUFUS HENRY NEAL.

